mark invalid and replaced values in database

src/counter.c

@@ -86,15 +86,17 @@ int main (void) {
     uint32_t diff = ringbufferGet();
   
     double f = 1.0 / (((double) diff) / 1000000.0);
+    int valid = settled ? 1 : 0;
 
     if (settled && (abs(f - lastF) > epsilon)) {
       logmsg(LOG_INFO, "Current f=%f, last f=%f, gradient too large, skipped\n", f, lastF);
       skipped++;
       f = lastF;
+      valid = 0;
     }
     lastF = f;
-//    printf("%f\n", f);
-    influxAddFrequency(f);
+//    printf("%f, %d\n", f, valid);
+    influxAddFrequency(f, valid);
 
     ledTick++;
     if (ledTick == 50) {